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There's an unofficial PC port for Sonic Unleashed

Back in 2008, Sonic Unleashed came out on PS2, PS3, Xbox 360 and Wii. It was a rather mediocre entry that had SEGA’s mascot transform into a "werehedgehog" or something… It mixed slower night-time levels with faster daytime ones.
Surprisingly, Sonic Unleashed was never released on PC. So a fan decided to bring the Xbox 360 version to our computers, featuring unlocked framerate, achievements and controller compatibility.
You can donwload it here via GitHub.